/*
 * Copyright 2020 OPPO ESA Stack Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package io.esastack.restlight.core.util;

import java.util.Arrays;
import java.util.Comparator;
import java.util.List;

public class OrderedComparator implements Comparator<Object> {

    public static final OrderedComparator INSTANCE = new OrderedComparator();

    public static void sort(List<?> list) {
        if (list.size() > 1) {
            list.sort(INSTANCE);
        }
    }

    public static void sort(Object[] array) {
        if (array.length > 1) {
            Arrays.sort(array, INSTANCE);
        }
    }

    @Override
    public int compare(Object o1, Object o2) {
        int i1 = getOrder(o1);
        int i2 = getOrder(o2);
        return Integer.compare(i1, i2);
    }

    public static int getOrder(Object obj) {
        if (obj != null) {
            Integer order = (obj instanceof Ordered ? ((Ordered) obj).getOrder() : null);
            if (order != null) {
                return order;
            }
        }
        return Ordered.LOWEST_PRECEDENCE;
    }

}
